Bootstrap Consul on Docker via Cloudconfig

bootstrap-consul.sh

#!/bin/bash


# Inspired by Brandon Philips' consul bootstrap script
# https://gist.github.com/philips/56fa3f5dae9060fbd100

source /etc/environment
num_expected_nodes=$1

do_join() {
    sleep 10
    docker exec consul /bin/consul join $@
}

docker pull progrium/consul

name=$(/bin/cat /etc/machine-id)
/usr/bin/etcdctl set /consul.io/bootstrap/machines/${name} ${COREOS_PRIVATE_IPV4}

# Attempt to create bootstrap key
if etcdctl mk /consul.io/bootstrap/started true; then
    export EXPECT=$num_expected_nodes
    echo "expecting $EXPECT nodes to join bootstrap cluster"
    $(docker run --rm progrium/consul cmd:run ${COREOS_PRIVATE_IPV4})
else
    ips=$(etcdctl ls /consul.io/bootstrap/machines | while read line; do
      echo "$(etcdctl get ${line}) "
    done)

    ip=$(echo $ips | sed 's/\ .*//')
    echo "This cluster has already been bootstrapped"
    echo "Joining IPs: $ips"

    do_join "$ips" &
    $(docker run --rm progrium/consul cmd:run ${COREOS_PRIVATE_IPV4}::$ip)
fi